Bronica SQ - vignetting or light leak ?

[awaken77]

I developed Delta 400 myself - no such artefacts:

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it seems a lab processing issue. unfortunately I cannot change lab, becouse there is only one in our city, capable to develop C-41 MF film

[Q.G.]

Just tell your lab what's happened, show them their and your results if necessary, and ask them to not do this again.
It's in their interest too not to screw up their customer's film.

[John Koehrer]

C-41 kits aren't especially difficult to use. Shouldn't need more than you have for B&W.